*{
    margin: 0;
    padding: 0;
    border: 0;
}

.border{
    width: 0;
    height: 0;
    border: 100px deepskyblue;
    float: left;
    margin-right: 10px;
}
.border2{
    width: 0;
    height: 0;
    border: 100px;
    border-left-color: red;
    border-right-color: yellow;
    border-top-color: blue;
    border-bottom-color: green;
    float: left;
    margin-right: 10px;
}
.border3{
    width: 50px;
    height: 50px;
    border: 75px;
    border-left-color: red;
    border-right-color: yellow;
    border-top-color: blue;
    border-bottom-color: green;
    float: left;
    margin-right: 10px;
}
.border4{
    width: 50px;
    height: 50px;
    border: 75px deepskyblue;
    float: left;
    margin-right: 10px;
}